你知道世界上有多少种语言吗？
没有人知道世界上有多少种语言。
Nobody knows how many different languages there are in the world.
没有人确切地知道世界上有多少种语言，部分原因是在一种语言和亚语言之间作出区分存在困难。
Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and a sub-language (or dialects within it).
你知道世界上有多少人以一种语言为母语吗？
Do you know how much people speaks a kind of language as mother language in the world?
你知道世界上有多少人以一种语言为母语吗？
Do you know how much people speaks a kind of language as mother language in the world?
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